Quasi-Two-Dimensional Nature of High-Tc Superconductivity in Iron-Based(Li,Fe)OHFeSe

• Published in: 中国物理快报（英文版） 2022-11, Vol.39 (12), p.77-84
• Main Authors: Dong Li, Yue Liu, Zouyouwei Lu, Peiling Li, Yuhang Zhang, Sheng Ma, Jiali Liu, Jihu Lu, Hua Zhang, Guangtong Liu, Fang Zhou, Xiaoli Dong, Zhongxian Zhao
• Format: Article
• Language: eng ; jpn
• ISSN: 0256-307X
• DOI: 10.1088/0256-307X/39/12/127402

The intercalated iron selenide(Li,Fe)OHFeSe has a strongly layered structure analogous to the quasi-two-dimensional(2D)bismuth cuprate superconductors,and exhibits both high-temperature(Tc)and topological superconductivity.However,the issue of its superconductivity dimensionality has not yet been fully investigated so far.Here we report that the quasi-2D superconductivity features,including the high anisotropy γ=151 and the associated quasi-2D vortices,are also revealed for(Li,Fe)OHFeSe,based on systematic experiments of the electrical transport and magnetization and model fittings.Thus,we establish a new vortex phase diagram for(Li,Fe)OHFeSe,which delineates an emergent quasi-2D vortex-liquid state,and a subsequent vortex-solid dimensional crossover from a pancake-like to a three-dimensional state with decreasing temperature and magnetic field.Furthermore,we find that all the quasi-2D characteristics revealed here for the high-Tc iron selenide superconductor are very similar to those reported for high-Te bismuth cuprate superconductors.